How do I include files in DrScheme?

Question

I'm using DrScheme to work through SICP, and I've noticed that certain procedures (for example, square) get used over and over. I'd like to put these in a separate file so that I can include them in other programs without having to rewrite them every time, but I can't seem to figure out how to do this.

I've tried:

(load filename)
(load (filename))
(load ~/path-to-directory/filename)
(require filename)
(require ~/path-to-directory/filename)
(require path-from-root/filename)

None of these works. Obviously I'm grasping at straws -- any help is much appreciated.

Answer 1

It's not clear from your question what language level you're using; certain legacy languages may make certain mechanisms unavailable.

The best inclusion/abstraction mechanism is that of modules.

First, set your language level to "module". Then, if I have these two files in the same directory:

File uses-square.ss:

#lang scheme

(require "square.ss")

(define (super-duper x) (square (square x)))

File square.ss :

#lang scheme

(provide square)

(define (square x) (* x x))

Then I can hit "run" on the "uses-square.ss" buffer and everything will work the way you'd expect.

Caveat: untested code.

Answer 2

I believe you are looking for:

(include "relative/path/to/scheme/file.scm")

The (require) expression is for loading modules.

Answer 3

In MIT/GNU Scheme, you can load a file with something like this:

(load "c:\\sample-directory\\sample-file.scm")

But I do not know if it works in DrScheme.

Answer 4

(require "~/path-to-directory/filename")